/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2012:
 *   Stanislav Poslavsky   <stvlpos@mail.ru>
 *   Bolotin Dmitriy       <bolotin.dmitriy@gmail.com>
 *
 * This file is part of Redberry.
 *
 * Redberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Redberry is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Redberry. If not, see <http://www.gnu.org/licenses/>.
 */
package cc.redberry.core.math.frobenius;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
final class SingleSolutionProvider extends SolutionProviderAbstract {
    SingleSolutionProvider(SolutionProvider provider, int position, int[] coefficient) {
        super(provider, position, coefficient);
    }

    @Override
    public int[] take() {
        if (currentSolution == null)
            return null;


        int i, remainder;
        for (i = 0; i < coefficients.length; ++i) {
            remainder = currentRemainder[i] - coefficients[i] * currentCounter;
            if (remainder < 0) {
                currentCounter = 0;
                currentSolution = null;
                return null;
            }
        }

        int[] solution = currentSolution.clone();
        solution[position] += currentCounter;
        ++currentCounter;
        return solution;
    }
}
